... 10.9 Product Details:1.Category: flat washer; spring washer; high pressure washer; square washer; bowl washer; F436M washer; loading washer ... 10mm,6-20mm,15-150mmThickness:0.3-22mm,0.8-12mm,3-18mm Surface treatment :Surrounded white zinc plating.or ... in aerospace, energy, electrical appliances, electronics, machinery, chemicals, metallurgy, automobile and other industries bolts and nuts screws